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<p>Feed supplementation with <i>Asparagopsis taxiformis</i> gametophytes has effectively mitigated enteric methane emissions from ruminants. Therefore, <i>A. taxiformis</i> has become an emerging aquaculture-target species due to increased demand for biomass. However, seasonality and ecological risks limit year-round production and large-scale expansion of open-ocean cultivation. Land-based cultivation not only enables year-round production through controlling abiotic factors but also reduces the ecological risks. Appropriate nutrient supplements are required for optimizing the land-based cultivation of <i>A. taxiformis</i>. The objective of this study is to evaluate the effects of various nutrient supplements on the growth, photosynthesis, protein contents and pigment contents of <i>A. taxiformis</i> gametophytes. Seven experimental treatments were evaluated: 1) artificial seawater without a nutrient source, AS; 2) von Stosch enrichment media (VSE); 3) Guillard's f/2 medium (f/2); 4) commercial fertilizer, Jack’s Professional (JP); 5) JP with vitamins (JPV); 6) modified VSE with the same N:P ratio as f/2 (VSE-f/2); 7) modified VSE with the same nitrogen source and N:P ratio as JP (VSE-JP). The growth, photosynthesis, protein and pigment contents at each experimental treatment were evaluated. The highest growth rates were 6% per day at JP, highlighting the potential of commercial land-based cultivation. Additionally, the highest net photosynthesis rate, protein and pigment contents were also observed at JP. Trace elements in JP might enhance the photosynthesis, protein and pigment synthesis. These results highlight the potential of JP as an effective and economical alternative to commonly used nutrient media for land-based cultivation of <i>A. taxiformis</i> gametophytes.</p>

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Nutrient supplementation improves growth and photosynthesis in Asparagopsis taxiformis gametophytes

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Jae Woo Jung,
  • Jang K. Kim

摘要

Feed supplementation with Asparagopsis taxiformis gametophytes has effectively mitigated enteric methane emissions from ruminants. Therefore, A. taxiformis has become an emerging aquaculture-target species due to increased demand for biomass. However, seasonality and ecological risks limit year-round production and large-scale expansion of open-ocean cultivation. Land-based cultivation not only enables year-round production through controlling abiotic factors but also reduces the ecological risks. Appropriate nutrient supplements are required for optimizing the land-based cultivation of A. taxiformis. The objective of this study is to evaluate the effects of various nutrient supplements on the growth, photosynthesis, protein contents and pigment contents of A. taxiformis gametophytes. Seven experimental treatments were evaluated: 1) artificial seawater without a nutrient source, AS; 2) von Stosch enrichment media (VSE); 3) Guillard's f/2 medium (f/2); 4) commercial fertilizer, Jack’s Professional (JP); 5) JP with vitamins (JPV); 6) modified VSE with the same N:P ratio as f/2 (VSE-f/2); 7) modified VSE with the same nitrogen source and N:P ratio as JP (VSE-JP). The growth, photosynthesis, protein and pigment contents at each experimental treatment were evaluated. The highest growth rates were 6% per day at JP, highlighting the potential of commercial land-based cultivation. Additionally, the highest net photosynthesis rate, protein and pigment contents were also observed at JP. Trace elements in JP might enhance the photosynthesis, protein and pigment synthesis. These results highlight the potential of JP as an effective and economical alternative to commonly used nutrient media for land-based cultivation of A. taxiformis gametophytes.